在 Python 中,对于每个元素,返回字符串中找到子字符串的最低索引
要在 Python Numpy 中返回字符串中找到子字符串 sub 的最低索引,请使用 numpy.char.find() 方法。该方法返回整数输出数组。如果未找到 sub,则返回 -1。第一个参数是输入数组。第二个参数是要搜索的子字符串。
步骤
首先,导入所需的库 -
import numpy as np
创建一个一维字符串数组 -
arr = np.array(['KATIE', 'JOHN', 'KATE', 'AmY', 'BRADley'])
显示我们的数组 -
print("Array...\n",arr)获取数据类型 -
print("\nArray datatype...\n",arr.dtype)
获取数组的维度 -
print("\nArray Dimensions...\n",arr.ndim)获取数组的形状 -
print("\nOur Array Shape...\n",arr.shape)获取数组的元素数量 -
print("\nNumber of elements in the Array...\n",arr.size)要返回字符串中找到子字符串 sub 的最低索引,请使用 numpy.char.find() 方法 -
print("\nResult (find)...\n",np.char.find(arr, 'AT'))
示例
import numpy as np
# Create a One-Dimensional array of strings
arr = np.array(['KATIE', 'JOHN', 'KATE', 'AmY', 'BRADley'])
# Displaying our array
print("Array...\n",arr)
# Get the datatype
print("\nArray datatype...\n",arr.dtype)
# Get the dimensions of the Array
print("\nArray Dimensions...\n",arr.ndim)
# Get the shape of the Array
print("\nOur Array Shape...\n",arr.shape)
# Get the number of elements of the Array
print("\nNumber of elements in the Array...\n",arr.size)
# To return the lowest index in the string where substring sub is found, use the numpy.char.find() method in Python Numpy
# The method returns the output array of ints. Returns -1 if sub is not found.
# The first parameter is the input array
# The second parameter is the substring to be searched
print("\nResult (find)...\n",np.char.find(arr, 'AT'))输出
Array... ['KATIE' 'JOHN' 'KATE' 'AmY' 'BRADley'] Array datatype... <U7 Array Dimensions... 1 Our Array Shape... (5,) Number of elements in the Array... 5 Result (find)... [ 1 -1 1 -1 -1]
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